The 28-year-old officer announced his office as he tried to break up a dispute on the corner of Clark and Addison at 12:40 a.m. last June 26. According to witnesses and audio recorded on a nearby webcam, the off-duty officer intervened when a disturbance between two men and one of the men's girlfriend escalated on the southeast corner of Clark and Addison.

Tremaine Wilson, 30, blindsided the officer, knocking him out, according to witnesses and a police report. Wilson fled the scene and was arrested nearby. He was charged with six counts of aggravated battery to a police officer and two counts of aggravated battery in a public place.

At the time, Wilson was on parole after serving half of an eight-year sentence for carjacking. Last October, his parole was revoked and he returned to prison to await the outcome of the Wrigleyville case.

Last week, Judge Earl Hoffenberg accepted a plea agreement in which Wilson pleaded guilty to two counts of aggravated battery in a public place and the other six counts were dropped. Hoffenberg sentenced Wilson to supervised release and one-year in prison off-set by time served awaiting trial.

He was released the next day.

Brutal Sneak Attack

The officer suffered a concussion, facial injuries, and a cut to his head, according to a source. He joined the police department four years ago after leaving the Marine Corps as a sergeant, the source said.

On the webcam audio, a woman was heard encouraging her boyfriend to leave the officer alone on the street:

"He’s the police," the woman says before first responders arrive. "You can’t help him. He’s the police! The police ain’t helping nobody!"

Video reviewed by CWBChicago editors showed the intersection of Clark and Addison bustling with traffic at the time of the attack.

The driver of Yellow Taxi cab 4737 sat in his car on Addison staring directly at the commotion. Two other cabs were also seen driving slowly past the intersection, but their vehicle numbers are not identifiable in the video.